Resumo. Tools that make possible street tree analysis include phytosociological descriptions to express relative species importance. To this work, it was collected information from 15 unit plots of an inventory held in 2010 in the city of Curitiba, in Paraná state. On this base, the phytosociological description indexes were calculated with dominance expressed by DBH (m) and by Crown Area (m²) to obtain distinct Importance Values (VI), and with density expressed by species performance index (SPI) and dominance expressed by Crown Area (m²) to calculate another VI. Results showed that species classification by relative frequency (proportion of individuals) exalt the importance of species with a greater number of trees and that species classification by VI obtained by dominance described by DBH tend to exalt the importance of those with a greater trunk size. On the other hand, the attainment of VI by dominance described by crown area tend to express a better species participation on street tree composition and the attainment of VI by the species performance index shows more clearly the abundance, the dimensions and the condition of the trees.